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Related Experiment Videos

Genetic code 1990. Outlook.

T H Jukes1

  • 1Space Sciences Laboratory, University of California/Berkeley, Oakland 94608.

Experientia
|December 1, 1990
PubMed
Summary
This summary is machine-generated.

The genetic code is not static and is evolving, with 9 known variations from the universal standard. These changes involve codon reassignment, often preceded by codon disappearance and reappearance with new functions.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • The genetic code, a nearly universal set of rules for translating DNA into proteins, has historically been considered highly conserved.
  • However, instances of deviations from this universal code have been identified, particularly within mitochondrial and nuclear genomes.

Purpose of the Study:

  • To investigate the proposed mechanism of genetic code evolution, focusing on codon disappearance and reappearance.
  • To explore the role of wobble pairing and mutation pressure in driving these genetic code changes.
  • To discuss the anomaly of selenocysteine coding and the potential for discovering further code variations.

Main Methods:

  • Analysis of known departures from the universal genetic code (9 identified: 6 mitochondrial, 3 nuclear).

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  • Hypothesizing a model where codon reassignment is preceded by codon functional loss and subsequent re-emergence.
  • Examining the evolution of wobble pairing and the impact of directional mutation pressure on codon usage.

    • Main Results:

    • Identified 9 documented variations in the genetic code across different organisms and organelles.
    • Proposed a model where codon disappearance, functional compensation by synonymous codons, and subsequent reappearance with new functions precede code changes.
    • Highlighted the role of evolving wobble pairing and mutation pressure in codon usage and potential reassignment, including stop codons.

    Conclusions:

    • The genetic code is dynamic and continues to evolve, evidenced by documented variations.
    • Codon reassignment is likely facilitated by a process of disappearance, functional substitution, and reappearance.
    • Further discoveries of genetic code variations are anticipated through comparative analyses of open reading frames and protein sequences.